Seal Monitoring Program

Background

In 2024, Rhode Island Division of Marine Fisheries implemented a seal monitoring program. The purpose of this program is to understand the distribution, movement, and population dynamics for gray seals (Halichoerus grypus), harbor seals (Phoca vitulina), harp seals (Pagophilus groenlandicus), and hooded seals (Cystophora cristata). 

The monitoring program currently consists of two major projects:

1. Seal Counts

   From September to April, seal counts are conducted monthly at 15 sites around Narragansett Bay, coinciding with the seasonal peak in seal presence during the winter months. Three of these sites, considered major haul-outs, are monitored year-round to account for the growing population and the potential presence of resident seals. Narragansett Bay surveys are conducted using a spotting scope to count individuals by species, while entanglement, disturbance, and environmental parameters are also recorded. Additionally, seal counts on Block Island are conducted year-round using both a live-stream camera feed and in-person observations with a spotting scope to monitor the growing gray seal population at North Lighthouse.

2. Seal Tagging

   In collaboration with Mystic Aquarium, rehabilitated seals are tagged with satellite and/or acoustic tags to better understand their distribution, residence time, and post-rehabilitation success. This data is also being used in collaboration with Atlantic Shark Institute to determine how the growing seal population will influence the presence of sharks around Block Island. 

For more information about this program, please contact Tara Plee (tara.plee@dem.ri.gov)